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. I 0. E. SORIBNER AUTOMATIC SIGNALING CIRCUIT FOR TELEPHONE EXCHANGES.

H Patented Jan. 8,1882.

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4 d. E 'SGRIBNER. AUTOMATIC SIGNALING CIRCUIT FOR TELEPHONE. EXCHANGES.No. 251,955. Patented Jan. 3,1882.

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UNITED STATES PATENT OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERNELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.

AUTOMATIC SlGNALlNG-CIRCUIT FOR TELEPHONE-EXCHANGES.

SPECIFICATION forming part of Letters Patent No. 251,955, dated January3, 1882.

" Application filed March 28, 1881.

To all whom it may concern:

Be it known that I, CHARLES E. SCRIBNER,

of Chicago, Illinois, have discovered certain new and usefulImprovements in Automatic Signaling-Circuits for Telephone-Exchanges, ofwhich the following is a full, clear,concise, and exact description,reference being bad to the accompanying drawing, forming a part of thisspecification. l

My invention consists of an insulated arm attached to the lever of theautomatic switch. This arm vibrates with the lever, and whilein motionholds open the circuit of the returnwire. An aununciator in the circuitof the return-wire at the central oflice is thus caused to notify thelistening operator that a subscriber has taken down or hung up atelephone. The operator is thereby relieved from the necessity ofkeeping the telephone constantly at his ear.

In the drawing, Figure 1 shows my invention.

A is the central office, and B a subscrlbers outfit, shown in detail. Cand D are also subscribers offices. a be are telephone-lines of thethree subscribers. d is the common return-wire. The arm 0 is attached tothe lever of the automatic switch, and vibrates with it, moving betweenthe contact-pointsfaud g.

It will be seen that while the arm is moving from one contact-point toanother the circuit of battery It in the common return-wire d will beheld open. The shutter'i 0f the annunciator at the central oflice in thecircuit of the wire at is thus thrown down, and the local circuit ofhell 7; closed. Bell k will thus ring until the shutter is restored.

(No model.)

It is evident my invention may be adapted to a normally-open circuit.The line may be run to many stations, and provided at each 40 with acontact-point near the insulated arm attached to the switch, so arrangedthat the circuit will be closed for a short time while the switch ispassing, from one position to the other.

In Fig. 2, Sheet 2, the line d is shown connected with the annunciator land with point muear the insulated arm 6 attached to the lever at thesubscribers station. The weight of the telephone holds the lever inposition 50 indicated by the full lines. On taking down the telephonethe lever assumes the position indicated by the dotted lines. The arm isthus for a moment in contact with contactspring' m and the shutter t" isthus thrown 5 down, closing the local circuit of the hell.

I claim- 1. The circuit breaking or closing arm a, in combination withthe automatic switchand a normally open or closed return-circuit, and an60 annunciator and battery included in said circuit, whereby listeningoperator is notified when a subscriber takes down or hangs up atelephone.

2. The insulated arm attached to the switch- 6 lever, in combinationwith a circuit including a battery and annunciator, whereby a signal isgiven automatically when the switch-lever is passing from eitherposition to the other, as and for the purpose set forth. v

CHARLES E. SCRIBNER.

Witnesses:

GEORGE P. BARTON, CALVIN DEWOLF.

